The Summary Research on the Noise of High-Speed Traction Elevators

Jing

et al. 2023

PurposeThis paper aims to guide the implementation of noise reduction measures in hoistway and reduce the aerodynamic noise generated by elevator operation, this paper aims to propose an aerodynamic noise analysis method that can solve the flow field in hoistway.Design/methodology/approachA turbulence-acoustic model solving the flow field in a hoistway and a numerical wind hoistway model of the ultra-high-speed elevator were established by using large eddy simulation (LES) and Curle acoustic theory.FindingsThe characteristics of pulsating flow field and aerodynamic noise around ultra-high-speed elevator are analyzed. The asymmetric characteristics of the flow field could be observed using the turbulent kinetic energy and the instantaneous vortexes in the wind hoistway model. Vortex shedding, air flow separation and recombination around the car were the key factors for aerodynamic noise generation. The sound pressure level was approximately linear to the logarithm of car speed. The increase of car deflection angle in a certain range would reduce the peak frequency of wake noise and increase the sound pressure level (SPL) value.Originality/valueThis paper provides important guidance for researches studying the aerodynamic noise in the hoistway and the technical personnel that look for the reduction measures, which greatly improves the shortcomings in the numerical simulation of the aerodynamic noise of the hoistway.

Section: Aerodynamic Noise Characteristicssupporting

confidence: 90%

Flow behavior and aerodynamic noise characteristics of ultra-high-speed elevator based on large eddy simulation

Jing

et al. 2023

“…In many studies, although ENV sources were introduced, most of them were from the perspective of a mechanical system and little was covered in terms of CM solutions for HRB [14,15,[26][27][28][29][30][31][32][33][34][35][36]48]. Thus, in this study, ENV sources and transmission paths of HRB are analyzed.…”

Section: Review Of Env Sourcesmentioning

confidence: 99%

“…To solve these problems, multiple studies have been conducted, which mostly focused on mechanical and electric aspects [6,7,10,[26][27][28][29][30][31][32][33][34][35][36]. However, it is not easy to solve ENV problems only with machinery solutions for HRB elevators that run at a speed of >90 m/min [21,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Construction Management Solutions to Mitigate Elevator Noise and Vibration of High-Rise Residential Buildings

Kang

Lee

et al. 2020

Sustainability

In high-rise residential buildings (HRBs), elevators run at a high speed, which causes problems such as change of atmospheric pressure, noise, and vibration. Elevator noise and vibration (ENV) of HRBs causes both mental anxiety and a consistently negative effect for promoting a comfortable residential area. Therefore, a solution for alleviating the ENV of HRBs is essential. To date, studies related to ENV have been mostly conducted in the approach of mechanical and electric aspects. There have been few cases conducted from the perspective of construction management (CM), which integrates design and construction. Therefore, the aim of this study is to propose CM solutions to mitigate the ENV of HRB. For this study, the CM solution is presented after identifying the ENV problems of HRBs through documented research and case measurement. By measuring the noise of HRB that the solution was applied to, the noise level, especially in a range of >125 Hz, was extensively reduced. The result of this study will be used as sustainable guidelines that alleviate ENV problems in the process of design and construction of HRB elevators. It is expected that studies for improving ENV problems that occur in high-rise elevators will increase on the basis of the results of this study.

International Journal of Aeroacoustics

“…1 When the elevator speed exceeds 6 m/s, aerodynamic noise will replace other noises as the primary sound source of the ultra-high-speed elevator. 2,3 Noise exceeding the standard not only affects ride comfort but also affects the normal operation of the equipment. From this, the issue of aerodynamic noise has become a key technical problem that urgently needs to be solved in the development of the elevator towards ultra-high speeds.…”

Section: Introductionmentioning

confidence: 99%

Analysis of vortex structures evolution and aeroacoustic characteristics in the ultra-high-speed elevator ring-gap flow field

Zhang,

Li,

Zhang

et al. 2023

The continuous improvement of elevator speed has made the issue of aerodynamic noise in the hoistway more prominent. Previous research has usually focused on the characteristics of aerodynamic loads and related safety issues, and little attention has been paid to the problem of flow-induced noise. This paper established a three-dimensional geometric configuration of the ultra-high-speed elevator to study the flow behavior and aerodynamic acoustic characteristics in the hoistway using well-validated large eddy simulations. Firstly, we analyzed the unsteady flow behavior in the ring-gap flow field using large eddy simulations and captured the transient vortex structure in the flow field using the Q-criterion. We then predicted the far-field aerodynamic noise of the elevator car using the Lighthill-Curle aerodynamic acoustic equations. The results showed that the factors affecting the sound source intensity of the elevator car include the shedding position and intensity of the vortex structures. By adjusting the shedding position and reducing the intensity of the vortex structure, the sound source intensity of the elevator car wall could be effectively controlled. The change of the blocking ratio could not affect the attenuation of aerodynamic noise in the hoistway, but the increase of the blocking ratio could lead to an increase in the turbulent kinetic energy intensity and peak SPL in the hoistway. Therefore, the blocking ratio should be kept within 0.65 when designing the hoistway structure dimensions.